linuxthreads/lockfile.c

   1 /* lockfile - Handle locking and unlocking of stream.
   2    Copyright (C) 1996, 1998, 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <bits/libc-lock.h>
  21 #include <stdio.h>
  22 #include <pthread.h>
  23 #include "internals.h"
  24
  25 #ifdef USE_IN_LIBIO
  26 #include "../libio/libioP.h"
  27 #endif
  28
  29 #ifndef SHARED
  30 /* We need a hook to force this file to be linked in when static
  31    libpthread is used.  */
  32 const int __pthread_provide_lockfile = 0;
  33 #endif
  34
  35 void
  36 __flockfile (FILE *stream)
  37 {
  38 #ifdef USE_IN_LIBIO
  39   __pthread_mutex_lock (stream->_lock);
  40 #else
  41 #endif
  42 }
  43 #ifdef USE_IN_LIBIO
  44 #undef _IO_flockfile
  45 strong_alias (__flockfile, _IO_flockfile)
  46 #endif
  47 weak_alias (__flockfile, flockfile);
  48
  49
  50 void
  51 __funlockfile (FILE *stream)
  52 {
  53 #ifdef USE_IN_LIBIO
  54   __pthread_mutex_unlock (stream->_lock);
  55 #else
  56 #endif
  57 }
  58 #ifdef USE_IN_LIBIO
  59 #undef _IO_funlockfile
  60 strong_alias (__funlockfile, _IO_funlockfile)
  61 #endif
  62 weak_alias (__funlockfile, funlockfile);
  63
  64
  65 int
  66 __ftrylockfile (FILE *stream)
  67 {
  68 #ifdef USE_IN_LIBIO
  69   return __pthread_mutex_trylock (stream->_lock);
  70 #else
  71 #endif
  72 }
  73 #ifdef USE_IN_LIBIO
  74 strong_alias (__ftrylockfile, _IO_ftrylockfile)
  75 #endif
  76 weak_alias (__ftrylockfile, ftrylockfile);
  77
  78 void
  79 __flockfilelist(void)
  80 {
  81 #ifdef USE_IN_LIBIO
  82   _IO_list_lock();
  83 #endif
  84 }
  85
  86 void
  87 __funlockfilelist(void)
  88 {
  89 #ifdef USE_IN_LIBIO
  90   _IO_list_unlock();
  91 #endif
  92 }
  93
  94 void
  95 __fresetlockfiles (void)
  96 {
  97 #ifdef USE_IN_LIBIO
  98   _IO_ITER i;
  99
 100   pthread_mutexattr_t attr;
 101
 102   __pthread_mutexattr_init (&attr);
 103   __pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE_NP);
 104
 105   for (i = _IO_iter_begin(); i != _IO_iter_end(); i = _IO_iter_next(i))
 106     __pthread_mutex_init (_IO_iter_file(i)->_lock, &attr);
 107
 108   __pthread_mutexattr_destroy (&attr);
 109
 110   _IO_list_resetlock();
 111 #endif
 112 }